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  • Cooling a mechanical oscillator to its ground state underpins many applications ranging from ultra-precise sensing to quantum information processing. The authors propose a new scheme that addresses the problem of the simultaneous cooling of many mechanical resonators with nearby frequencies.

    • Muhammad Tahir Naseem
    • Özgür E. Müstecaplıoğlu
    Article Open Access
  • An impurity introduced to a many-body quantum environment gets dressed by excitations and it is of a particular interest to understand the limits of the quasi-particle description. The authors theoretically and numerically study an ionic impurity immersed in a weakly interacting gas of bosonic atoms and demonstrate the existence of two main phases of a polaronic regime for weak interactions, and a strongly correlated state with many bosons bound to the ion.

    • Grigory E. Astrakharchik
    • Luis A. Peña Ardila
    • Antonio Negretti
    Article Open Access
  • Emergent collective behaviour has recently been addressed in systems of self-rotating particles, where motion, in particular, is an emergent phenomenon rather than a basic ingredient. Here, the authors derive a continuum model for mixtures of clockwise and counterclockwise Quincke spinners, demonstrating the emergence of same-spin phase separation, traffic lanes, sustained turbulent-like motion, and a chirality breaking transition depending on the fluid inertia of the system.

    • Cody J. Reeves
    • Igor S. Aranson
    • Petia M. Vlahovska
    Article Open Access
  • Due to a combination of strong spin orbit coupling and electron correlations iridates such as Sr2IrO4 exhibit a range of exotic quantum states that can be tuned via their electronic and magnetic properties. Here, the authors investigate the resistive and Raman scattering properties of Co-doped Sr2IrO4 and provide evidence for quantum critical fluctuations in the system.

    • Kousik Samanta
    • Jean C. Souza
    • Eduardo Granado
    Article Open Access
  • Non-line-of-sight imaging allows reconstruction and recognition of an obscured object, but external manipulation of the data can lead to inaccurate results. Here, the accuracy and robustness of passive non-line-of-sight recognition and its fragility to adversarial attacks are studied.

    • Yangyang Wang
    • Yaqin Zhang
    • Xueshuang Xiang
    Article Open Access
  • Spatiotemporal control has permitted the creation of velocity- and direction-tuneable light in free space. Here, numerical simulations propose a means to achieve a reciprocating flying focus by increasing the Rayleigh length and temporal chirp.

    • Zhaoyang Li
    • Yanjun Gu
    • Junji Kawanaka
    Article Open Access
  • The ferroelectric field-effect transistor, which has attracted much attention for application as both a highly energy-efficient logic device and a non-volatile memory device, has often been studied within the framework of equilibrium thermodynamics. Here, the authors theoretically demonstrate the importance of utilizing the correct thermodynamic potential and investigate the impact of free charge accumulation on the equilibrium performance of ferroelectric-based systems.

    • Jasper Bizindavyi
    • Anne S. Verhulst
    • William G. Vandenberghe
    Article Open Access
  • Plasmonics involves the engineering of light-matter interactions and has range of possible uses in the study of quantum phenomenon, but efficient plasmonic sources are required. The authors report a method to achieve efficient two-plasmon spontaneous emission using an epsilon-near-zero material with highly-confined surface plasmon polaritons to simultaneously serve as a two-plasmon emitter for emission acceleration.

    • Futai Hu
    • Liu Li
    • Yuanmu Yang
    Article Open Access
  • Characterizing the interactions between viral and human proteins is key to understand the function and structure of viruses such as SARS-CoV-2 and for informing drug design and repurposing strategies. Here, the authors use statistical physics techniques to perform a systematic multiscale comparison of the effects on the human interactome of SARS-CoV-2 with respect to other viruses, and find that COVID-19 exhibits properties typical of systemic diseases.

    • Arsham Ghavasieh
    • Sebastiano Bontorin
    • Manlio De Domenico
    Article Open Access
  • In the diffusive transport regime, the mean path length of waves has been shown to be independent of the microstructure of the medium. Here, this invariance is shown to persist into the ballistic and localized regimes, as well as into the regime of band-gap materials like photonic crystals.

    • Matthieu Davy
    • Matthias Kühmayer
    • Stefan Rotter
    Article Open Access
  • Optical frequency combs can provide phase-coherent links between optical frequencies and microwaves, allowing for precise optical frequency generation; however current technologies require external optical references or multiple power-intensive peripherals that make them less suitable for on-chip applications. Here, the authors present phase stabilization of a frequency microcomb without nonlinear processes nor external optical reference signals.

    • Abhinav Kumar Vinod
    • Shu-Wei Huang
    • Chee Wei Wong
    Article Open Access
  • Metamaterials are designed to control unconventional wave properties in acoustic systems with a range of applications such as acoustic cloaking. Here, the authors design an active acoustic Willis metamaterial that can realize decoupled polarizabilities beyond the bound of passivity and reciprocity.

    • Choonlae Cho
    • Xinhua Wen
    • Jensen Li
    Article Open Access
  • Optimising energy harvesting is relevant to a variety of micro and nanotechnologies with applications ranging from self powered nanodevices to microfluidic pumps in biological environments. Here, the authors show that an opportunely designed opto(/electro)-mechanical circuit can simultaneously demonstrate high efficiency and power production when operating in the vicinity of an exceptional point degeneracy implemented via a pseudo-PT symmetry.

    • Lucas J. Fernández-Alcázar
    • Rodion Kononchuk
    • Tsampikos Kottos
    Article Open Access
  • The COVID-19 pandemic has demonstrated the need for non-pharmaceutical epidemic mitigation strategies that can be effective even if they are limited in duration. Here, the authors derive analytically optimal and near-optimal time-limited strategies for limiting the epidemic peak in the Susceptible-Infectious-Recovered model and show that, due to the sensitivity of such strategies to implementation errors, timely action is fundamental to non-pharmaceutical disease control.

    • Dylan H. Morris
    • Fernando W. Rossine
    • Simon A. Levin
    Article Open Access
  • Early studies of lasing in parity-time(PT)-symmetric systems typically make use of the adiabatic elimination of the medium polarization. Here, the authors present a theoretical investigation of a realistic scenario where a laser is coupled to a passive optical cavity and study PT symmetry breaking in the strong light-matter coupling regime, finding nonclassical emission behavior in the microscopic limit.

    • Deshui Yu
    • Frank Vollmer
    Article Open Access
  • Quantifying heterogeneity and correlations in complex systems consisting of a large number of interacting elements is key to understand their emergent properties. Here, the authors propose a method based on the statistics of interclass mean first passage times or random walks, and use it to quantify in a non-parametric way the level of heterogeneity and the presence of correlations in multiscale complex systems, where nodes are associated to a discrete number of classes.

    • Aleix Bassolas
    • Vincenzo Nicosia
    Article Open Access
  • While progress has been made to formulate models for brain temperature regulation that incorporate non-simplified anatomy and vasculature, accounting for heterogeneity between individuals is still a challenge. Here, the authors propose a fully conserved biophysical model that, starting from an individual subject’s magnetic resonance-derived tissue and vessel structure, predicts individual patterns in local brain temperature in agreement with magnetic resonance thermometry.

    • Dongsuk Sung
    • Peter A. Kottke
    • Candace C. Fleischer
    Article Open Access